Sewing-machine



(Model.) 3 sheets-.sheet 1.

J. BIGELOW. Y

SEWING' MAGHINB.

No. 331,026. Patented Nov. 24, 188:5'.

N. PETRS. Phmo-Lnhognphar, Washinghn. D. CV

- (Model.) 3 Sheets-Sheet 2;

J.- BIGBL'OW.

SEWING MACHINE. l No. 331,026. Patented Nov.. Z4, 1885.

WTVESSES v {NAVE/WUR f@ @uM/ @im N. PETERS, Phamuchngnphr, wnhlngion, D.l;

(Model.) s sheetssheet s.

J. BGELOW.

SEWING MACHINE.

No., 331,026. Patented Nov, 24, 1885.

z J A Harney N4 PETERS. Fhuxo-Lilhngnpher, Wxhugtun, D. C.

UNITED STATES PATENT @Erica JOHN BIGELOW, OF PHILADELPHIA, PENNSYLVANIA.

SEWlNG-MACHBNE.

SPECIFICATION forming part of Letters Patent No. 331,026, dated November24, 1885.

` Application filed August 7, 1883. Serial No. 103,057. (Model.)

To all whom it may concern,.-

Be it known that I, JOHN BTGELOW, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inSewing-Machines; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersor figures of reference marked thereon, which form a part of thisspeciiication.

This invention consists of a modiiication of the construction of themechanism of my pending application No. 58,843, filed April 19, 1882.

Figure l is a side view, partly sectional, showing the general workingparts of my sewing mechanism, the actuating device of my trimmer, andparts of the irregular -stitch mechanism. Fig. 2 is a plan View of thebottom of the machine. Figs. 3, 4, and 5 are top and side views of thelooper, its actuating parts and connections therewith. Fig. 6 is asectional View of the needle-bar with its actuating device. Fig. 7 is afront elevation of the face-plate, showing upper-thread nipper, needle,and needle-bar, presser-foot, and part of the device for making thestitch zigzag or irregular. Fig. 8 is a side view of the neck (broken)of the machine, and shows the connection of the irregularstitch devicewith its actuating mechanism. Fig. 9 is a sectional view of theirregular-stitch-actuating mechanism. Figs. 1() and 11 are detailsshowing the parts for reciprocating the needle adapted to act on both ofits sides. Fig. l2 is a detail in section, showing the thread holes andgroove in the looper. Fig. 13 is a detail showing the means of adjustingthe needle-gage point W7. Fig. 14. is a perspective view of the looper.

The same letters ,indicate like parts when they occur in theaccompanying drawings.

The take-up spring y is placed behind the tension-disks y. Thenipperpiece 3f is secured by a screw to the top of the need1e-bar, andby an additional holding-piece, J, to the face of the same. The stud Fis secured to the crank-disk F by a nut, F2. The looperR is hinged onthe looper-rod piece P at R2, and a catch-spring, P2, arranged behind iton looper-rod piece P, so that when in its working position it will becaught at Ittandiirmly held by a shoulder, P3, on the spring P2.Bypressure at P2 the shoulder Pa can be withdrawn from contact with thelooper at R4, and the looper-point R can be turned up into a convenientposition for threading. The looperrod piece P is secured to the link Nby taper end bolts and jam-nuts P P in taper sockets, in order to allowtaking up for wear. The link N is secured to the bed A by a stud, N,with a taper endnut and jam-nut. Thelooperrod M is arranged to be adjusted as to length at M2, and is secured to its actuating-crank at M bya stud and a taper end nut and jam-nut. The thread-holes through thelooper R pass from the upper to the lower side, and are connected by aslot on its lower side. This places the deliveryspoint of thelooperthread in a position facing the bottom of the work-plate of themachine, and one which will make sure of the loop-holder Tengaging with'the loopen thread. The loop-holder T has a ,hook on its point, whichengages and holds the looperthread during a part of the formation of thestitch, and assists in causing asurplus amount of thread to bedelivered, so that the stitchI when finally set can have anyldesiredamount of looseness. The loop-holder T has a reciprocatingmovement,being pivoted at T and slotted at T2,so that it can engage astud,V2, in the feed-lever V, from which it receives its movement-s. Onthe looper-rod M is the looperthread controller O, placed so that itsmovements will be between the stationary guides O2 and O3 of the lowerthread, x. This arrangement allows me to do away with aspringincontrolling the lower or looper thread other than the one used at thetension-disks O4. The needle S is attached to the needle-bar J at S',and receives vertical reciprocation by the revolution of the shaft Ethrough the crank-disk F, stud F', slidingblock G, and cross-head PI. Bymeans of equal-sized beveled gears the rotary movements of the shaft Eare conveyed throughthe vertical shaft L to the looper-rod IOO crank-pinM. The circular movement of the end of the looper-rod M at M,and itsreciprocation at P through connection with the link N, which swings onthe stationary stud N in the 5 bed-plate A,causes the point R of thelooper R, which is attached to the looper-rod piece P on the rod M, nearto the swinging point P', to move on the line of a flattened oval. Theline of reciprocation of the needle S is 1o within the said oval;consequently thel move- .15 and the needle S depressed to its lowestpoint,

its thread z, Fig. 1, is nipped at g5 between the spring y* andDipper-piece g3, which are carried by the needle-bar J. As the needlerises its thread is thus caused to throw out a loop, which the looper Rimmediately takes by a forward movement. The loop thus taken slipslalong the looper R and over its shoulder and offset R3. As theneedle-eye is raised clear from the work, the nipper-spring y* isVreleased from its hold on the needlethread by its projection at ifpassing up an incline, ys, Fig. 7, attached to the face-plate C of themachine. A strain is, however, kept on the thread by means of thethreadguide y2 on the top of the needle-bar J, takeup spring y', .andtension-disks y, Fig. l. The take-up spring y is not always used,especially at high speed. When the needle reaches its highest point, isfree from the work,

and begins to descend, the looper-point R is nearest to itsactuating-center L, and swinging around one of the smaller ends of itsoval. At this time the feed takes place, and its lever V, by means ofits stud V acting at Ton the loop-holder T, which swings at T, causessaid loop-holder at T to move in a transverse direction to the line ofmovement of the looper-point R. The hook of the loop-holder, under whichthe looper-thread delivery-point Rpasses, is thus caused to take andhold the looper-thread x, Fig. 2. At the same time the looper-threadcontroller O, which is attached to the looper-rod M at a point nearesttothe end M', and the movements of which it follows, has itsthread-holding point O carried out of line with the thread-guides 02 andO3. lIt consequently draws an amount of thread through the tension-disksO4 equivalent to that used in the previous stitch. As the needledescends, the looper Ris drawn back on the side of the needle oppositeto that which it passed in its forward movement.

Itsshoulder and offset R3 holds the needleloop which it has over ituntil it is drawn back beyond the needle-line, while its own thread, isheld by the holder T. As soon as the needle-point has engaged the loopthusmade, the continued backward movementy of the looper Itv causes theneedle-loop which it y 6 5 is holding to slip over the shoulder R3andoff The nippcr at g5 checks a furthe point R.

ther delivery of thread to the needle, and 'obliges it in its furtherdescent and first rising movement to draw up and set its loop droppedfrom the looper R. Vhen the looperpoint It in drawing back reaches aboutthe line of the needle, its lthread-controller point O begins to returntoward a line drawn between O2 and O3, and causes a free delivery of thethread m to the looper. The position of the controller Oon the rod M inits relation to the point M affects the amount of movement ofthe pointO', and in consequence, with the assistance of the tension-disks 0*,thel tightness or looseness of the set in the stitch of thelooper-thread w. As the needle rises, .the looper moves forward, againtakes the needlethread, and the stitch is formed as described.

Combined with the sewing mechanism described I have added a trimmingdevice, de-

scribed in my application No. 58,845', April 18, 1882, to which I conveymotion bythe cam U5 on the vertical shaft Il; This cam actuates a stud,U, in the lever U? on the bar U, and conveys a rocking motion to anupper shear-blade at the end of said bar U nearest to thev needle. Thelower blade is held in proper position by the block U. When theneedle-bar is raised, the upper blade also is raised (the shears opened)and the feed takes place, carrying the work into the jawsof the shears.As the needle descends, through the action of the cam U5, the upperblade closes on the lower and trims the fabric.

Other of the Well-known trimming devices may be used with said sewingmechanism. I show the present one to illustrate that the combination maybe made.

With the combination of this sewing and trimming mechanism and thezigzag-stitch mechanism, as shown in Division B of thiscase, the seamcovered by my cut hose patent, No. 9,113, dated March 9, 1880, can bemade, although either mechanism can be used' separately or applied toother machines and. for other purposes. claim is made to the devicesshown in Figs. 2, 7, 8, 9, 10,11, and 13 of the drawings,whi'ch relateto the mechanism for making the zigzag or virregular stitch. These areall em- IOO IIO

In this case no specic bodied in Division B of this case, filed October22, 1885, Serial No. 180,591, and the invention therein shown is dulydescribed and claimed in that division.

I claim- 1. In combination with the reciprocating needle of asewing-machine, the looper R, constructed substantially as shown,andhaving a groove along its lower edge and between eyes, arrangedsubstantially as described and shown.

2. In combination with the stitch-forming mechanism of a sewing-machine,a looper provided with supporting means which` permits said looper to beturned up for convenience of threading, substantially as described.

3. In combination with the needle of a sewing-machine, a looper, R,attached to a looper-threadholder reciprocated transversely swingingbar, provided with a bearing at each to the line of movement of thepoint of the of its ends, substantially as described. looper,substantially as described.

4. In combination with sewing mechanism In testimony whereof I affix mysignature 5 to make a stitch substantially as described, in presence oftwo witnesses.

tWo stationary thread-guides, a looper-thread controller, and means forpositively operating JOHN BIGELOW the same, substantially as described.Witnesses:

5. In combination With the stitch-forming JOS. GREENWOOD,

1o mechanism, substantially as described, a LIsLE SroKEs.

